Takahashi Sunao

Sunao is Reiji's class' most popular girl. She has the ability to turn any conversation interesting no matter what, and is very sociable and friendly. She was nicknamed ‘the class queen’ by Ami due to her ability in controlling conversations and standing in the center of trends happening in their class.
However, Ami rapidly notices that she is a self-centered girl who feels disdain for her classmates. After having her rank robbed by Ami, she falls into a deep depression and exposes herself to Reiji, leading her to join their club later on. While both of them shared the controlling aspect, Sunao differed from Ami however in that her method was much more direct.

Edited from gangrelion's review and aquaspirit39's review